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Viewing: Alias.js

import { anchorIsValid } from '../doc/anchors.js';
import { visit } from '../visit.js';
import { ALIAS, isAlias, isCollection, isPair } from './identity.js';
import { NodeBase } from './Node.js';
import { toJS } from './toJS.js';

class Alias extends NodeBase {
    constructor(source) {
        super(ALIAS);
        this.source = source;
        Object.defineProperty(this, 'tag', {
            set() {
                throw new Error('Alias nodes cannot have tags');
            }
        });
    }
    /**
     * Resolve the value of this alias within `doc`, finding the last
     * instance of the `source` anchor before this node.
     */
    resolve(doc) {
        let found = undefined;
        visit(doc, {
            Node: (_key, node) => {
                if (node === this)
                    return visit.BREAK;
                if (node.anchor === this.source)
                    found = node;
            }
        });
        return found;
    }
    toJSON(_arg, ctx) {
        if (!ctx)
            return { source: this.source };
        const { anchors, doc, maxAliasCount } = ctx;
        const source = this.resolve(doc);
        if (!source) {
            const msg = `Unresolved alias (the anchor must be set before the alias): ${this.source}`;
            throw new ReferenceError(msg);
        }
        let data = anchors.get(source);
        if (!data) {
            // Resolve anchors for Node.prototype.toJS()
            toJS(source, null, ctx);
            data = anchors.get(source);
        }
        /* istanbul ignore if */
        if (!data || data.res === undefined) {
            const msg = 'This should not happen: Alias anchor was not resolved?';
            throw new ReferenceError(msg);
        }
        if (maxAliasCount >= 0) {
            data.count += 1;
            if (data.aliasCount === 0)
                data.aliasCount = getAliasCount(doc, source, anchors);
            if (data.count * data.aliasCount > maxAliasCount) {
                const msg = 'Excessive alias count indicates a resource exhaustion attack';
                throw new ReferenceError(msg);
            }
        }
        return data.res;
    }
    toString(ctx, _onComment, _onChompKeep) {
        const src = `*${this.source}`;
        if (ctx) {
            anchorIsValid(this.source);
            if (ctx.options.verifyAliasOrder && !ctx.anchors.has(this.source)) {
                const msg = `Unresolved alias (the anchor must be set before the alias): ${this.source}`;
                throw new Error(msg);
            }
            if (ctx.implicitKey)
                return `${src} `;
        }
        return src;
    }
}
function getAliasCount(doc, node, anchors) {
    if (isAlias(node)) {
        const source = node.resolve(doc);
        const anchor = anchors && source && anchors.get(source);
        return anchor ? anchor.count * anchor.aliasCount : 0;
    }
    else if (isCollection(node)) {
        let count = 0;
        for (const item of node.items) {
            const c = getAliasCount(doc, item, anchors);
            if (c > count)
                count = c;
        }
        return count;
    }
    else if (isPair(node)) {
        const kc = getAliasCount(doc, node.key, anchors);
        const vc = getAliasCount(doc, node.value, anchors);
        return Math.max(kc, vc);
    }
    return 1;
}

export { Alias };
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Viewing: Alias.js

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